By Chris Emma–

LAKE FOREST, Ill. (CBS) — A Bears defense playing well as of late is missing one of its key players in practice.

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Linebacker Danny Trevathan was held out of work on Wednesday with what coach John Fox called a calf strain. Trevathan suffered the injury in the game against the Saints on Oct. 29 and hasn’t practiced since.

“He’s making progress,” Fox said.

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The Bears got a boost on offense with the return of receiver Markus Wheaton, who had been held out with a groin injury. Wheaton worked in a limited fashion. He could be available to play against the Packers on Sunday.

Wednesday’s injury report also included tight end Dion Sims (illness), linebacker Roy Robertson-Harris (hamstring), defensive back Bryce Callahan (knee) and defensive back Sherrick McManis (hamstring) being held out. Guard Kyle Long (finger) worked in a limited fashion.

Packers coach Mike McCarthy officially ruled out tight end Martellus Bennett during his press conference with the media in Green Bay.

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Chris Emma covers the Bears, Chicago’s sports scene and more for Follow him on Twitter @CEmma670 and like his Facebook page.